If memory serves, when the album came out the media kept asking the band what the three LED symbols on the cover meant. They dodged the question for about a year, until some bright fella figured out that the three symbols were the band (Most noticeably, the middle symbol resembles Sting, when he use to punk his hair up in front)
After you know this, they images jump out at you and you can't look at the album cover again without clearly seeing them. We all thought it was pretty cool back then!